/*
 * Copyright 2009 Armando Blancas
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package tests.taskgraph.tasks.data;

import java.io.IOException;

import junit.framework.Assert;
import junit.framework.JUnit4TestAdapter;

import org.junit.After;
import org.junit.Before;
import org.junit.Test;

import taskgraph.channels.Channel;
import taskgraph.ports.InputPort;
import taskgraph.ports.OutputPort;
import taskgraph.tasks.Graph;
import taskgraph.tasks.Task.Wait;
import taskgraph.tasks.data.GlobalUnique;

public class GlobalUniqueTest {

	/**
	 * Runs the test suite in this class from the command line.
	 * 
	 * @param args	Arguments are ignored.
	 */
	public static void main(String[] args) {
		org.junit.runner.JUnitCore.runClasses(GlobalUniqueTest.class);
	}
	
	/**
	 * Provides compatibility with 3.x versions of JUnit.
	 * 
	 * @return A 3.x-compatible test suite.
	 */
	public static junit.framework.Test suite() {
		return new JUnit4TestAdapter(GlobalUniqueTest.class);
	}
	
	
	private InputPort<Product> input;
	private OutputPort<Product> output;
	
	@Before
	public void setup() {
		Channel<Product> channel = new Channel<Product>();
		output = channel.getOutputPort();
		input = channel.getInputPort();
	}
	
	@After
	public void cleanup() throws IOException {
		output.close();
		input.close();
	}
	
    /*+----------------------------------------------------------------------+
	  |                                                                      | 
	  | Test the constructors.                                               | 
	  |                                                                      | 
	  +----------------------------------------------------------------------+*/
	
	@Test
	public void defaultConstructor() {
		GlobalUnique<Product> task = new GlobalUnique<Product>();
		Assert.assertNotNull(task);
	}
	
	@Test
	public void defaultInstanceClass() {
		GlobalUnique<Product> task = new GlobalUnique<Product>();
		Assert.assertEquals(GlobalUnique.class, task.getClass());
	}

	@Test
	public void constructorWithPorts() {
		GlobalUnique<Product> task = new GlobalUnique<Product>(input, output);
		Assert.assertNotNull(task);
	}
	
    /*+----------------------------------------------------------------------+
	  |                                                                      | 
	  | Test the run method.                                                 | 
	  |                                                                      | 
	  +----------------------------------------------------------------------+*/
	
	@Test
	public void testDistinct() throws IOException, InterruptedException {
		Product[] products = {
			new Product(5005, "Notebook", 2.50f),
			new Product(1400, "Pencil",   0.49f),
			new Product(5005, "Notebook", 2.50f),
			new Product(0001, "Eraser",   0.60f),
			new Product(1400, "Pencil",   0.49f),
			new Product(1400, "Pencil",   0.49f),
			new Product(4040, "Bookend", 10.25f),
			new Product(5005, "Notebook", 2.50f)
		};

		Graph graph = new Graph();
		Channel<Product> ch1 = new Channel<Product>();
		Channel<Product> ch2 = new Channel<Product>();
		GlobalUnique<Product> task = 
			new GlobalUnique<Product>(ch1.getInputPort(), ch2.getOutputPort());
		OutputPort<Product> outputPort = ch1.getOutputPort();
		InputPort<Product> inputPort = ch2.getInputPort();
	
		for (Product p : products) 
			outputPort.write(p);
		outputPort.close();
		
		graph.add(task);
		graph.execute(Wait.WAIT);
		
		Assert.assertEquals(products[3],  inputPort.read()); // 0001
		Assert.assertEquals(products[1],  inputPort.read()); // 1400
		Assert.assertEquals(products[6],  inputPort.read()); // 4040
		Assert.assertEquals(products[0],  inputPort.read()); // 5005
		inputPort.close();
	}

    /*+----------------------------------------------------------------------+
	  |                                                                      | 
	  | Negative tests for constructors.                                     | 
	  |                                                                      | 
	  +----------------------------------------------------------------------+*/

	@Test(expected=IllegalArgumentException.class)
	public void constructorWithNullInputPort() throws IOException {
		new GlobalUnique<Product>(null, output);
	}

	@Test(expected=IllegalArgumentException.class)
	public void constructorWithNullOutputPort() throws IOException {
		new GlobalUnique<Product>(input, null);
	}

    /*+----------------------------------------------------------------------+
	  |                                                                      | 
	  | Negative tests.                                                      | 
	  |                                                                      | 
	  +----------------------------------------------------------------------+*/

}
